CVE-2022-31394

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2023-02-21 · updated 2026-06-17
Weakness: CWE-770

Description

Hyperium Hyper before 0.14.19 does not allow for customization of the max_header_list_size method in the H2 third-party software, allowing attackers to perform HTTP2 attacks.

Affected products

hyperium hyper: before 0.14.19 — fixed in 0.14.19

How to fix

Upgrade to a fixed version: hyperium hyper 0.14.19. Check the vendor advisory for mitigations.

References

https://github.com/hyperium/hyper/compare/v0.14.18...v0.14.19
https://github.com/hyperium/hyper/issues/2826
https://github.com/hyperium/hyper/pull/2828
https://github.com/hyperium/hyper/compare/v0.14.18...v0.14.19
https://github.com/hyperium/hyper/issues/2826
https://github.com/hyperium/hyper/pull/2828

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